Hi Burr,

Yeah variable radius means the fillet changes from one radius to another as it travels along the length of the fillet.

Like here is an example of a variable radius fillet between 2 planes, it starts at a large radius and then changes into a smaller radius:




I'm not really familiar with a style that moves the center of the fillet though, so I'm not sure what that is called. Do you have a link to the video?

I guess it must be something other than a circular arc fillet, because you can't really move the center of an arc and still have it tangent to the surfaces...

- Michael